diff --git a/TODO.md b/TODO.md
index e5d1e48..1dcf2f4 100644
--- a/TODO.md
+++ b/TODO.md
@@ -36,3 +36,4 @@
 - [DISPATCHED] (esp_agent, protocol_agent) Coordinate serial bridge message format and heartbeat timing
 - [DISPATCHED] (ui_agent, pc_agent) Align Web UI controls with Qt GUI
 - [DONE] (root_agent) Final ESP+UI integration audit (see docs/progress/2025-06-19_root_audit_esp_ui.md)
+- [DONE] (timeline_agent) Milestone v0.4.0 summary dispatched (docs/reports/milestone_v0.4.0_summary.md)
diff --git a/docs/progress/2025-06-19_05-30_timeline_agent_summary_complete.md b/docs/progress/2025-06-19_05-30_timeline_agent_summary_complete.md
new file mode 100644
index 0000000..f6e6658
--- /dev/null
+++ b/docs/progress/2025-06-19_05-30_timeline_agent_summary_complete.md
@@ -0,0 +1,6 @@
+# Timeline Agent Log
+Date: 2025-06-19 05:30 CEST
+
+- Completed milestone v0.4.0 summary as instructed.
+- File created: `docs/reports/milestone_v0.4.0_summary.md`.
+- Updated TODO entry and dispatch log (`docs/progress/root_agent_dispatch_to_timeline.md`).
diff --git a/docs/progress/root_agent_dispatch_to_timeline.md b/docs/progress/root_agent_dispatch_to_timeline.md
new file mode 100644
index 0000000..19d670e
--- /dev/null
+++ b/docs/progress/root_agent_dispatch_to_timeline.md
@@ -0,0 +1,7 @@
+# Dispatch Log – 2025-06-19 05:30 CEST
+
+Created `docs/reports/milestone_v0.4.0_summary.md` describing milestone progress and agent contributions. Timeline agent instructed to finalise the summary and mark the TODO entry as done.
+
+Reference instruction: *Timeline Agent – Milestone v0.4.0 Summary Dispatch*.
+
+Summary location: `docs/reports/milestone_v0.4.0_summary.md`.
diff --git a/docs/reports/milestone_v0.4.0_summary.md b/docs/reports/milestone_v0.4.0_summary.md
new file mode 100644
index 0000000..626eadc
--- /dev/null
+++ b/docs/reports/milestone_v0.4.0_summary.md
@@ -0,0 +1,40 @@
+# Milestone v0.4.0 Summary
+
+## Overview
+Milestone **v0.4.0** introduced WiFi connectivity through the ESP8266-01 module. Command relay and OTA updates were added alongside a unified configuration strategy and extensive documentation. A pin configuration file (`config/pins.conf`) now centralises all hardware assignments and both CLI and GUI utilities read the same settings. Shared GPIO control logic was moved out of agent-specific modules, allowing the firmware and ESP layer to share definitions.
+
+Compatibility notes emphasise that all peripherals must be 3.3 V tolerant and that pins below D20 remain reserved for the LCD shield.
+
+## Participating Agents and Contribution Highlights
+- **root_agent** – Planned and dispatched the milestone tasks, then audited the ESP and UI integration.
+  - Dispatch log: `docs/progress/2025-06-18_17-43-41_root_agent_v0.4.0_dispatch.md`
+  - Audit log: `docs/progress/2025-06-19_root_audit_esp_ui.md`
+- **timeline_agent** – Logged hardware wiring updates, created `config/pins.conf`, and documented OTA procedures.
+  - Progress log: `docs/progress/2025-06-19_04-47-00_timeline_agent_gpio_ota.md`
+- **docs_agent** – Produced configuration references for pinout and OTA steps.
+  - Progress log: `docs/progress/2025-06-19_04-55-19_docs_agent_configuration.md`
+- **ui_agent** – Added a minimal Web UI for ESP8266 control and configuration.
+  - Progress log: `docs/progress/2025-06-19_04-55-19_ui_agent_web_ui.md`
+- **esp_agent** – Received prompts to implement the UART bridge and heartbeat.
+  - Prompt file: `docs/prompts/esp_agent/2025-06-18_17-43-41_v0.4.0_plan.md`
+- **protocol_agent** – Coordinated message formats with the ESP firmware.
+  - Prompt file: `docs/prompts/protocol_agent/2025-06-18_17-43-41_v0.4.0_plan.md`
+- **firmware_agent** – Updated command handling and tests for integration.
+  - Progress log: `docs/progress/2025-06-18_14-58-47_firmware_agent.md`
+- **pc_agent** – Maintained GUI tests and added stubbed ESP responses.
+  - Progress log: `docs/progress/2025-06-18_12-38-06_pc_agent_gui_test_stub.md`
+
+Additional coordination prompts:
+- `docs/prompts/ui_agent/2025-06-18_17-52_coord_pc_agent.md`
+- `docs/prompts/pc_agent/2025-06-18_17-52_coord_ui_agent.md`
+- `docs/progress/2025-06-18_18-10-00_esp_protocol_sync.md` (ESP↔Protocol sync)
+
+## Dispatched Prompts and Logs
+The milestone kickoff generated prompts for every agent under `docs/prompts/*/2025-06-18_17-43-41_v0.4.0_plan.md`. Execution logs are stored in `docs/progress/` with timestamps as shown above.
+
+## Known Gaps or Postponed Features
+- Full ESP8266 firmware with UART bridge and OTA handler remains in progress.
+- Protocol validation tests are pending from `test_coverage_agent`.
+- PC tool integration for ESP status monitoring is partially stubbed.
+
+Milestone v0.4.0 established the hardware foundation and documentation for wireless control, paving the way for complete WiFi-based operation in the next release.